How to convert char 'A' to binary '1010' in java language

Question

I want to convert character type to binary but not char byte to bit.

I'll show you example.

if char = 'A' but actually it's hex! A = 1010 I have a character type but I want to represent it like hexadecimal.

Of course, I have only character data that can be matched hexadecimal. like 9, 8, A, C, D not 47, U, Y ..

And Can I count size or length of 1 in 1010 ?

If you know how to solve this please let me know thank you!

I'm voting to close this question as off-topic because it's a textbook example of "Do my thing for me" — Shark, Jul 06 '18 at 09:59
This is a duplicate of [how to convert a char from alphabetical character to hexadecimal number in java](https://stackoverflow.com/questions/4477714/how-to-convert-a-char-from-alphabetical-character-to-hexadecimal-number-in-java) specifically "To read hex and convert to binary you can do..." (messed up my close vote...) — Michael, Jul 06 '18 at 10:05
Please explain more clearly what you mean by _And Can I count size or length of 1 in 1010_? — OldCurmudgeon, Jul 06 '18 at 10:27
Possible duplicate of: https://stackoverflow.com/questions/4477714/how-to-convert-a-char-from-alphabetical-character-to-hexadecimal-number-in-java — Mykyta Lebid, Jul 06 '18 at 10:34
To "_count size or length of 1 in 1010_" see: [Count bits used in int](https://stackoverflow.com/questions/2935793/count-bits-used-in-int) — LuCio, Jul 06 '18 at 10:37

score 2 · Answer 1 · answered Jul 06 '18 at 10:23

2

Simple Steps

Here you can convert any Alphabet to the binary number

System.out.println(Long.toString(Long.parseLong("A", 16), 2)); //Output 1010

Thanks

answered Jul 06 '18 at 10:23

Faiz Akram

score 1 · Answer 2 · answered Jul 06 '18 at 10:24

1

You can most easily (and probably most efficiently) use Character.digit().

    int a = Character.digit('A', 16);
    System.out.println(Integer.toBinaryString(a));

answered Jul 06 '18 at 10:24

OldCurmudgeon

score 1 · Answer 3 · answered Jul 06 '18 at 10:26

1

Since the input is a char, convert using the helper method from Character:

int num = Character.getNumericValue(ch);

Then convert it to a binary string:

String s = Integer.toBinaryString(num);

answered Jul 06 '18 at 10:26

Andy Turner